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Brother S-7200B Service Manual page 74

Single needle direct drive straight lock stitcher with thread trimmer
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13. TROUBLESHOOTING
Problem
13
Broken needles
14
Oil gauge (1) is not visible
in oil gauge window.
15
Machine does not operate
when power is turned on
and treadle is pressed.
16
Machine does not operate
at high speed.
17
Machine
stops
sewing.
67
Is the material being pushed or pulled with excessive force during
sewing?
Is the needle properly installed?
If it is incorrect, install the needle correctly.
Is the needle bent, is the needle tip blunt, or is the needle hole
blocked?
Replace the needle.
Is the needle and rotary hook timing correct?
Adjust the height of the needle bar.
Adjust the clearance between the needle and the tip of the
rotary hook.
Is the needle timing too advanced with respect to the feed dog?
Retard the needle timing.
Caution
It is extremely dangerous to leave any pieces of broken
needle sticking in the material. If the needle breaks, search
for all pieces until the whole of the needle is found again.
Furthermore, we recommend that through steps be taken to
account for such needles to comply with product liability
regulations.
0469M
Is the oil tank empty?
(-[]0[], []3[] specifications)
Fill the oil tank with oil.
2195M
Is the power supply connector
disconnected from the control
box?
Insert
securely.
Is the sewing speed setting or backtack speed setting incorrect?
Use the sewing speed control keys to set the high speed.
during
Is the fixed stitch key turned on?
Press the fixed stitch key so that the indicator turns off.
Is the power supply voltage too low?
Check the power supply.
(If the power cord is too long or too many appliances are being
run from a single outlet, this may cause voltage drops which will
in turn cause the reset function to activate and stop the
machine, even if the power supply itself is normal.)
Possible cause
the
connector
S-7200B
Page
Instruction
manual
30
31
30
Instruction
manual
Instruction
manual
2196M
Instruction
manual
Instruction
manual

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